Lubrication for screw making and turning lathes



ay 17 L. K. BRAREN v LUBRICATION FOR SCREW MAKINGAND TURNING LATHES Filed June 9, 1924 2 Sheets-Sheet 1 S1, WM, MDLQMWW M-L y 17 2 L. K. BRAREN LUBRICATION FOR SCREW MAKING AND TURNING LATHBS Filed. Juno 9, 1924 2 Sheets-Sheet 2 xllll m Patented May 17, 1927.

UNITED STATES I 1,,e2a451 PATENT OFFICE.

LORENZ KONRAD BRAREN, OE MUNICH, GERMANY, ASSIGNOR TO THE FIRM FRIED- RICH DECKEL, FABRIK F'll'R PRAZISIONSMECHANIK UND MASCHINENIBAU, OF

MUNICH, GERMANY.

LUBRICATION FOR SCREW MAKING AND TURNING LATHES.

Application filed June 9, 1924, Serial No. 718,724, and in Germany July 2, 1923.

h The object of ,my invention is to provide an improved type of lubrication for the cutting tools used in an automatic screw machine, whereby the lubricant or coolant is.

delivered direct to the different cutting points without employing the usual line of piping that hampers more or less the operation and adjustment of the cutting tools.

A further object of my invention is to provide means for effectually preventing any splashing and throwing off of the lubricant from rotating cutting tools.

The lubricant under the improved system is caused to flow axially in the feeding direction of the material completely surrounding the latter, impinging thus against any tool coming into contact with the mater al. In this manner a very perfect lubricating and cooling action is achieved whereby also all chips are washed away right after having formed. Th s manner of lubrication is especially of advantage for tools working axially and surrounding the end of the material as for instance hollow mills and'threading dies where otherwise a perfect lubrication is doubtful. v

Of course although my invention is shown applied to turning and threading lathes it may as well be used for any similar'machine tool where a bar of material is held by a... collet, chuck or other gripping device andwhere one or more tools are performing cutting operations near to the holding point.

In the drawings accompanying and forming part of this specification Fig. 1 is a side elevation of an automatic screw machine with the invention applied. Fig. 2 is a view of the spindle nose partly in section on an enlarged scale. The stand 1 for the frame 2 of the screw machine is formed in the upper part to serve as a container 3 for the lubricant'or coolant. A pump 4 in the present case a gear pump driven by a pulley 5, delivers lubricant under pressure into' the pipe line 6, a by pass 7 permitting the liquid to stream back'into the container 3 when the pressure in the line 6 exceedsa certain amount. The pipe line 6 is arranged inside of the container 3 up to a point 8 in the cover plate 10 underneath a bore 9 in the frame 2 so that a straight connection with union 11 and regulating cock 12 is all that may be seen .of the lubricant system from the outside. A spindle 13 is journaled in a bore of the frame 2. The bar of material 14 is located inside of the spindle and held 13 there is a cap 17 held in a bayonet man ner by two shoulder screws 18 against the face of the frame 2.

The rear portion of the cap 17 is a running fit over an enlarged portion of the spindle 13 while the front part surrounds the nose of the spindle with a certain amount of clearance. A hole 19 connects this space with the bore 9 in the frame 2 permitting the lubricant to enter. A conical hole in the front wall of the cap 17 for the bar of material 14 to pass through is made large enough to permit a tubular stream of liquid to flow through enveloping completely the bar of material.

A groove 20 in the rear portion of the cap 1 with a hole 21 connecting to the outside is provided for draining off any liquid forced through the running fit towards the rear and preventing it entering the bearing of the spindle.

A tool carrier 16 pivoted to the frame 2 with a tool 22 fastened to it shows how the lubrication of a stationary tool is accomplished.

A threading die 23 on a holder 24, which is fastened to a spindle 25 is used for cutting threads on the end of the part worked upon. To prevent the lubricant being thrown off by the fast rotating die a tubular guard 26 has been provided which is fastened to a collar 27. The latter is held axially be-.

tween the die holder 24 and a collar 28 but is free to turn on the spindle 25. Two pins 29 opposite each other'on the collar 27 prevent rotation and are adapted to slide in grooves 30 of a tube 31 which is fastened by screws 32 to the bearing 33 of the thread mechanismhousing 34. The latter is mounted on the frame 20f the screw machine. The lubricant returns through a filter 35 to the oil reservoir 3.

Having now full explained the nature of this my invention do not wish to be understood as limiting myself to the exact details of construction nor to the particular applications shown, as obviously many modifications w1ll occur to a person skilled in the art.

. workpiece, a casing forming a chamber projecting from the holder, and means for around said ho'der and having a relatively small discharge passage in its end wall through which the work piece is adapted to project and around which a relatively thin stream of lubricant is adapted to be discharged coaxially of the work piece and upon the projecting portion thereof, and ineans for supplying lubricant to the cham- Jer.

3. In a turning and threading machine, a

work holder adapted to support a work piece, a casing for the holder forming a lubricant chamber about the same, said casing including an end wall through which a portion of the holder is adapted to project in slightly spaced relation whereby to form a restricted discharge passage for the lubricant coaxially of the holder to effect discharge of the lubricant upon the work piece supplying lubricant to the chamber.

4. In a turning and threading machine, a workholder, a casing for the holder forming a lubricant chamber about the same, said casing including an end wall through which a portion of the holder is adapted to project in slightly spaced relation whereby to form a restricted discharge passage for. the lubricant coaxially of the holder, a cutting tool for the work rotatable about the axis of the holder, a sleeve encircling the cutting tool. adapted to receive the lubricant thrown off thereby, and means for supplying lubricant to said chamber.

5. In a turning and threading machine a lubricant pump, a pressure line, a chamber connected to said pressure line, a holder for the bar of material worked upon extending into said chamber and an orifice surrounding the bar of material to have the liquid flow axially surrounding the material from said chamber.

6. In a turning and threading machine a rotating holder for gripping the bar of material worked upon, a bearing for said holder, a chamber partly surrounding said holder for receiving the lubricant under pressure, an orifice in said chamber for causing the liquid to fiow onto and in the axial direction of the bar of material and means for preventing liquid from passing from the chamber to the inside of said bearing supporting the material holder.

7. In a turning and threading machine a holder for gripping the bar of material worked upon, a rotating tool working axially upon the end of material protruding from said holder, a pressure line for the lubricant, means for causing the liquid to flow onto and in the axial direction of the bar of material against said rotating tool working axially upon the material and means for preventing the liquid from flying off from the rotating tool.

8. In a turning and threading machine. a holder for gripping the bar of material worked upon, a rotating tool working axially upon the end of material protruding from said holder, a pressure line for the lubricant, said pressure line leading the lubricant close to said holder, an orifice for causing the stream of lubricant to flow substantially in the axial direction of the material against said rotating tool, and a guard surrounding said rotating tool for catching any liquid thrown off thereby, said guard being ill) arranged to move axially with said rotating tool but being held against rotation.

9. In a turning and threading mechanism means for holding the bar of material worked upon, a rotating tool working upon the end of said bar of material and protruding from said holding means, said rotating tool also performing axial movements, a lubricating line discharging lubricant onto the bar of material and the rotating tool, a

' guard for catching the liquid thrown on by LORENZ'KONRAD BEAR-EN.

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